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  1. Wikipedia | Definition, History, & Facts | Britannica

    www.britannica.com › topic › Wikipedia

    May 19, 2021 · Wikipedia, free Internet-based encyclopedia, started in 2001, that operates under an open-source management style. It is overseen by the nonprofit Wikimedia Foundation and is one of the most-visited sites on the Internet. It uses a collaborative software known as wiki for editing articles.

  2. So far there have been five notable mass extinctions on Earth. A growing number of scientists argue that we’re now in the midst of a sixth. Postcards from the 6th Mass Extinction is a podcast hosted by John P. Rafferty that attempts to personalize extinction, emphasizing the survival challenges that familiar forms of life currently face, while at the same time considering the pivotal roles ...

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  4. Biographies browse | Britannica

    www.britannica.com › biographies

    Elizabeth Warren, American legal scholar and politician... Kurt Warner. American football player. Kurt Warner, American professional gridiron football... Fred Astaire. American dancer and singer. Fred Astaire, American dancer onstage and in motion... Kris Kristofferson. American singer, songwriter, and actor.

  5. Adolf Hitler | Biography, Rise to Power, & Facts | Britannica

    www.britannica.com › biography › Adolf-Hitler

    Adolf Hitler, leader of the Nazi Party (from 1920/21) and chancellor and Fuhrer of Germany (1933–45). He was the leader of Germany during that country’s participation in World War II, and he oversaw the Nazi Party’s implementation of the Holocaust, which resulted in the deaths of millions of people.

  6. nanoparticle | Definition, Size Range, & Applications ...

    www.britannica.com › science › nanoparticle

    Nanoparticle, ultrafine unit with dimensions measured in nanometers. Nanoparticles exist in the natural world and are also created as a result of human activities. Because of their size, they have unique material characteristics, and manufactured nanoparticles have practical applications in a variety of areas.

  7. Jeff Bezos | Biography, Amazon, & Facts | Britannica

    www.britannica.com › biography › Jeff-Bezos

    Jun 22, 2021 · Jeff Bezos , byname of Jeffrey Preston Bezos, (born January 12, 1964, Albuquerque, New Mexico, U.S.), American entrepreneur who played a key role in the growth of e-commerce as the founder and chief executive officer of Amazon.com, Inc., an online merchant of books and later of a wide variety of products.

  8. Mauritius | Facts, Geography, & History | Britannica

    www.britannica.com › place › Mauritius

    Jul 23, 2021 · Geographical and historical treatment of Mauritius, including maps and a survey of its people, economy, and government. Mauritius is an island country, part of the Mascarene Islands, off the eastern coast of Africa. Port Louis is the capital. Learn more about Mauritius here.

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